Chemicals 2

Theme             Learning about the environment

Basic science    J.S.S.2   First Term

WEEK 9

Chemicals 2

Performance Objectives                        

The student should be able to:

1. Define chemicals

2. Classify chemicals based on their usage.

Content

Chemicals

A chemical is any substance consisting of matter. This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas). They can either occur naturally or can be created artificially.

Examples of Naturally-Occurring Chemicals

Naturally-occurring chemicals can be solid, liquid, or gas. Naturally occurring solids, liquids, or gases may be made up of individual elements or may contain many elements in the form of molecules.

• Gases: Oxygen and nitrogen are naturally-occurring gases. Together, they…